I was out of town when we had a power outage and when I got back and booted up the terastation it reported a raid error on all 4 drives. It's clear that at least one drive is okay since the unit rebooted successfully (since the OS partition is mirrored over all 4 drives) so my guess is that the raid filesystem information on partition 3 was corrupted. I have 2nd brand new terastation that was not online during the power failure and have tried swaping the disk cages between this new unit and the old one. Unfortunately, this didn't work (i.e. the unit with the old disks show the same error while the new disks are fine) which is why I think it's a problem with the data on the disk and not a hardware issue.

While much of the data was backup and the original files are still around, there is a small amount of personal information that was not stored elsewhere and I'd really like to get it back. The old unit is still under warranty and Buffalo will replace it, but I suspect that a reformat would do as well. I just want to make all reasonable attempts to recover the data before I do that. Any suggestions would be very much appreciated.

For what it's worth, the old system was running firmware rev 1.08, the new one is 1.12.

have you tried accessing via EM-mode?? by holding the init button and then simultaneously pressing the power button, that might get you access to the device, however, I wouldn't know if you would get access to the data.

Don't know much about Raid 5 or TS but had the odd disk or two fail so sorry to hear that.Usually one error fails at a time -although this isn't always true for a power cut or say a cup of coffee poured in.

Anyway, before wiping data is there a way of finding out how many disks/stripes went down - if only one it should still be able to recover something -no?

1- take out cage, wipe partion on a fault disk - stick in other terrastation2 - other terrastation repairs/rebuilds array ? then fails on repair/rebuild ( think the repair worked, the rebuild failed )3 - take cage out and move to original terrastation - flash with old firmware and the terrastation repairs/rebuilds array4 - the original terrastations still ----ed since on power of loses firmware and goes to engineering mode5 - move disk cage to other terrastation and works fine

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